I got this notice (attach below) after update Drupal core to 8.3.6
how to fix this, thank you

bootstrap err.jpg4.97 MBzheleong
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zheleong created an issue. See original summary.

zheleong’s picture

solved! thank you.

tip-ok’s picture

Please, write how did you fix this?

sylus’s picture

I have had this same issue but I think it was unrelated to Bootstrap.

What turned out to be my problem was:

#2900531: Classes should be array of strings for Panels IPE

markcarver’s picture